Irish Whiskey, craft beer barrels. Like all the best conversations, the one between Jameson’s Head of Whiskey Science and the Head Brewer of a local craft beer brewery, started at the bar. A swapping of whiskey and beer barrels soon after, resulted in Jameson Caskmates Stout Edition – triple-distilled, blended Irish Whiskey that has been patiently finished in Irish craft beer-seasoned barrels.